/*
 * Copyright (c) 2008-2016 Haulmont.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package com.haulmont.cuba.gui.data.aggregation;

import com.haulmont.cuba.gui.components.AggregationInfo;

import javax.annotation.Nullable;
import java.util.Collection;
import java.util.EnumSet;

public interface Aggregation<T> {

    T sum(Collection<T> items);

    T avg(Collection<T> items);

    @Nullable
    T min(Collection<T> items);

    @Nullable
    T max(Collection<T> items);

    int count(Collection<T> items);

    Class<T> getResultClass();

    EnumSet<AggregationInfo.Type> getSupportedAggregationTypes();
}